4-line to line Decoders/demultiplexers. Each or these 4-line-toline decoders utilizes TTL circuitry to decode four binary-coded inputs into one of. MOS technology. A binary code applied to the four inputs (A to D) provides a low level at the selected one of sixteen outputs excluding the other fifteen outputs. SNN .. of significant portions of TI information in TI data books or data sheets is permissible only if reproduction is without alteration.
|Published (Last):||16 July 2008|
|PDF File Size:||6.99 Mb|
|ePub File Size:||16.67 Mb|
|Price:||Free* [*Free Regsitration Required]|
Low Level Input Current. Y Typical power 774154 mW. Sign up using Email and Password. All the other ouputs stay high. Low Level Output Current. High Level Input Current. Many TTL parts and older memory chips have active low enable inputs, so datashest active low outputs of this part can be connected directly to those inputs.
Y Alternate Military Aerospace device is avail. The active-low output is just how the design for that specific decoder was carried out – there is also active-high varieties. For example, if the target application requires 16 7-segment LED displays, but your microcontroller datahseet has 4 lines to select which display is active, this chip 74LS would provide a very effective method of essentially multiplying you selecting lines by a 4 times.
View PDF for Mobile. The active-low enable inputs allow cascading of demultiplexers over many bits. Y Input clamping diodes simplify system design.
That is, for an input ofthe 0 output is selected, and it is driven low. Dxtasheet Level Input Voltage. Absolute Maximum Ratings Note.
High to Low Level Output. Y Decodes 4 binary-coded inputs into one of 16 mutually.
Datasheet, PDF – Alldatasheet
First, the inversion of the outputs simply means that the output is active low. This allows more flexibility in the logic functions available. When either strobe input is high, all outputs are high. These demultiplexers are ideally suited for implementing high-performance memory decoders.
This chip is often used in demultiplexing applications, such as digital clocks, LED matrices, and other graphical outputs. Y Performs the demultiplexing function by distributing data. National Semiconductor Electronic Components Datasheet. Free Air Operating Temperature. However, due to the internal structure of theonly one output can be dataaheet at a time. Low to High Level Output.
The demultiplexing function is performed by dataxheet the 4 input lines to dataheet the output line, passing data from one of the strobe inputs with the other strobe input low.
Email Required, but never shown. My first question is more important All inputs are buffered and input clamping diodes are provided to minimize transmission-line effects and thereby simplify system design.
According to the internal logic diagram on the datasheet, the G inputs are connected catasheet a two-input AND gate with inverting inputs, whose output feeds one input of all the NAND gates that produce the outputs.
Datasheet pdf – 4-Line to Line Decoders/Demultiplexers – National Semiconductor
Note 2 Not more than one output should be shorted at a time. I OS Short Circuit. Each or these 4-line-toline decoders utilizes TTL circuitry to decode four binary-coded inputs into one of sixteen mutually exclusive outputs when both the strobe inputs, G1 and G2, are low.
If you wanted to generate a 1 of demultiplexer, you could use 16 s looking at the 4 least significant bits, while a single would look at the 4 most significant bits, with one ouput going to each of the other 16 s.
Since the ouputs are active low, NAND gates do the job.